[PATCH] [lld][ELF][ARM] Mapping symbols for PLT entries

[Denis Protivensky]

Hi ruiu, shankarke,

Make PLT entry atoms represent mapping symbols in the Release mode, while in the Debug mode they are still function-like symbols with regular names.
It's legal that mapping symbols denote unnamed parts of code, and PLT entries are not required to have function-like names (in fact, they didn't have these names before in the Release mode).
This trick is done to simplify the code and not keep mapping symbol atoms along with regular PLT atoms.

http://reviews.llvm.org/D8819

Files:
  lib/ReaderWriter/ELF/ARM/ARMRelocationPass.cpp
  test/elf/ARM/plt-mapping.test

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